Analysis and Improvement of Excessive Floating Mud during AAO Process Operation
The characteristics of rural domestic sewage are low COD concentration,high ammonia-nitrogen concentration,carbon-nitrogen ratio im-balance.Carbon and dissolved oxygen are the key factors in the denitrification.Insufficient carbon and poorly controlled dissolved oxygen will lead to incomplete denitrification in the anoxic tank,and nitrification solution will enter the sedimentation tank directly.If the sludge discharge efficiency of the sedimentation tank is poor and the sludge is not in time,denitrification reactions are prone to occur,resulting in excessive floating mud.Therefore,it is necessary to solve the problem of excessive floating sludge from two aspects:improving sludge discharge and enhancing denitrification efficien-cy.
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